The first hurricane ever known to have formed over the South Atlantic
Ocean could threaten the coast of Brazil by early next week.

While the tropical part of the South Atlantic Ocean has large areas
with the 80-degree or warmer ocean temperatures needed to sustain hurricanes,
upper atmosphere winds are usually blowing much faster than winds near the
surface or in the opposite direction. Such "wind shear" can rip apart storms
before they grow into hurricanes.